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2. Mix about 0*5 gram each of powdered malic acid and
resorcinol, and add r c.c. of concentrated sulphuric acid.
Warm the mixture for a moment over the llame until it
begins to froth. On cooling and adding water and caustic soda,
solution, an intense blue fluorescence is produced (von Peehmann).


Succillic Acid (Kthylenedicarboxylic Acid),

Schmitt, Aiuialen, 1800, 114,   100.
10 grins, malic acid.
30           hydriodic acid.
2     ,,      red phosphorus.

The hydriodic acid is conveniently prepared, according to
Gattermann, as follows: A small round flask (too c.c.) is
provided with a tap-funnel and delivery-tube, the latter being
attached to a U-tube as shown in Fig. 70. The LMube is filled
with broken glass or pot, which
has been coated with amor-
phous phosphorus by rubbing
it in the phosphorus slightly
moistened with water. The
flask Is first detached from the

and funnel, and 44
grams of iodine introduced.*
Four grams of yellow phos-
phorus, cut in small pieces, are
then added. The phosphorus
must be cut under water,
brought on to filter-paper with
crucible tongs, pressed for a moment, and transferred with
tongs to the flask. Each piece of phosphorus as it drops in
produces a flash. When the phosphorus has been added a dark
coloured liquid is obtained, which solidifies on cooling, and
consists of PI;{. The flask, when cold, is closed with its cork,
and the delivery tube from the LMube is inserted loosely into
the neck of a small flask containing 50 c.c. of watei.-, so that
the open end of the delivery-lube is above the surface of the
water. It is kept in position by a wedge of cork fixed in the
COHKN'S ADV. l. O. C.                                                   f